30 ppm FC with 30 ppm CYA is about equivalent to 5.5 ppm FC with no CYA, but I wouldn't put the FC that high since indoor pools with no CYA and with liners aren't something I've heard of. The 5.5 (instead of "about 3") is because the chart columns are disinfecting chlorine and FC level is roughly double that (at a pH of 7.5).

I think the typical "shock" level of 0.3 ppm disinfecting chlorine is more than sufficient. That is, about 12 ppm FC with 30 ppm CYA should be fine.

Richard